* {
  margin: 0;
  padding: 0;
}

body{
  background: snow;
}

h1{
  text-align: center;
  margin: 0 auto;
  padding: 5px;
  font-weight: bolder;
}

table{
  width: 98%;
  text-align: center;
  margin: 10px 1%;
}

td{
  border: 1px solid black;
  background: white;
  padding: 5px;
  font-weight: bolder;
}

.equals{
  background: red;
}

.triple:hover{
  background: blue;
}